Smirking Spelljacker 
Creature — Djinn Wizard Rogue
$2.95 #7114 0.31 2.5 years
Flash
Flying
When this creature enters, exile target spell an opponent controls.
Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost.
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Cards similar to Smirking Spelljacker expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Transcendent Dragon97%
$0.35↓#70730.71↑1.5 years
"Flash"
Gale's Redirection88%
$0.30↓#9375↓0.224.4 years↑
"You may cast the exiled card without paying its mana cost for as long as it remains exiled."
Jace's Mindseeker80%
$0.35↓#14466↓0.3113.3 years↑
"Flying"
Diluvian Primordial80%
$0.24↓#3761↑0.3513.7 years↑
"Flying"
Etali, Primal Storm76%
$0.45↓#281↑0.88↑8.8 years↑
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Shell of the Last Kappa76%
$0.70↓#22417↓0.53↑22.1 years↑
"
, 
, Sacrifice this card: You may cast a spell from among cards exiled with this card without paying its mana cost."
, , Sacrifice this card: You may cast a spell from among cards exiled with this card without paying its mana cost."
Malcolm, Alluring Scoundrel76%
$1.89↓#1582↑0.312.9 years
"Flash"
+1 more matching line
Nightveil Specter76%
$0.53↓#8951↓0.3513.7 years↑
"Flying"
Herald of Amity76%
$0.22↓#10575↓0.07↓0.5 years↓
"Flying"
Skyway Robber76%
$0.30↓#16947↓0.334.5 years↑
"Flying"
Ashiok's Erasure75%
$0.25↓#20433↓0.19↓6.7 years↑
"When this enchantment enters, exile target spell."
Opposition Agent74%
$19.42↑#596↑2.39↑5.9 years↑
"Flash"
Goliath Daydreamer73%
$0.26↓#9597↓0.15↓0.7 years↓
"Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them without paying its mana cost."
Subtlety73%
$10.24↑#4241↑0.80↑5.5 years↑
"Flash"
+1 more matching line
Jeleva, Nephalia's Scourge72%
$3.25↑#14172↓0.3313.0 years↑
"Whenever this card attacks, you may cast an instant or sorcery spell from among cards exiled with this card without paying its mana cost."
Venser, Shaper Savant72%
$0.45↓#1986↑0.2919.5 years↑
"Flash"
Draining Whelk72%
$0.40↓#13413↓0.44↑20.0 years↑
"Flash"
Aven Interrupter71%
$3.17↑#1931↑0.67↑2.5 years
"When this creature enters, exile target spell. It becomes plotted."
Spell Queller71%
$0.28↓#10441↓0.2410.2 years↑
"When this creature enters, exile target spell with mana value 4 or less."
+1 more matching line
Windbrisk Heights70%
$0.25↓#663↑0.11↓19.0 years↑
"
, : You may play the exiled card without paying its mana cost if you attacked with three or more creatures this turn."
, : You may play the exiled card without paying its mana cost if you attacked with three or more creatures this turn."